Process for bleaching lignocellulose pulp

C - Chemistry – Metallurgy – 12 – P

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C12P 19/14 (2006.01) C12P 19/00 (2006.01) C12P 19/04 (2006.01) C12P 19/12 (2006.01) C12S 3/08 (2006.01) D21H 25/02 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2627846

Lignocellulose pulp is bleached by bleaching a pulp in aqueous alkali solution with oxygen and treating the pulp with an enzyme, while a liquid fraction delivered from the enzyme treatment step is subjected to a penetration treatment through a separation membrane, for example, reverse osmosis membrane, to separate a permeated fraction from a non-permeated fraction; the permeated fraction is fed to the alkali-oxygen bleaching (oxygen delignification) step and is used as a liquid medium of the bleaching system; and non-permeated fraction is subjected to a xylooligosaccharide-collecting procedure.

La pâte lignocellulosique est blanchie dans une solution aqueuse alcaline oxygénée, puis la pâte est traitée avec un enzyme, alors qu'une fraction liquide provenant de l'étape de traitement par enzyme fait l'objet d'un traitement de pénétration dans une membrane de séparation, par exemple une membrane à osmose inverse, afin de séparer la fraction ayant subi une perméation d'une fraction n' ayant pas subi de perméation; la fraction ayant subi une perméation est utilisée à l'étape de blanchiment en solution alcaline oxygénée (délignification par oxygène) et sert de médium liquide du système de blanchiment; la fraction n'ayant pas subi de perméation est soumise à une procédure de collecte de xylooligosaccharide.

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